<template>
    <div>
        <input type="text" v-model="addForm.name">
        <el-upload class="avatar-uploader" 
        :auto-upload="false"
         ref="upload"
        :on-change="handleChange"
        action="https://jsonplaceholder.typicode.com/posts/" :show-file-list="false" :on-success="handleAvatarSuccess" :before-upload="beforeAvatarUpload">
            <img v-if="imageUrl" :src="imageUrl" class="avatar">
            <i v-else class="el-icon-plus avatar-uploader-icon"></i>
        </el-upload>
          <el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传到服务器</el-button>
    </div>
</template>

<script>
  export default {
    data() {
      return {
       addForm:{
            name:''
       },
        imageUrl: '',
      };
    },
    methods: {
        handleChange(file, fileList) {
            console.log(file)
             this.imageUrl = URL.createObjectURL(file.raw);
        // this.fileList3 = fileList.slice(-3);
      },
         submitUpload() {
        this.$refs.upload.submit();
      },
      handleAvatarSuccess(res, file) {
       alert('上传成功')
      },
      beforeAvatarUpload(file) {
        const isJPG = file.type === 'image/png';
        const isLt2M = file.size / 1024 / 1024 < 2;

        if (!isJPG) {
          this.$message.error('上传头像图片只能是 JPG 格式!');
        }
        if (!isLt2M) {
          this.$message.error('上传头像图片大小不能超过 2MB!');
        }
        return isJPG && isLt2M;
      }
    }
  }
</script>
<style>
  .avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }
  .avatar-uploader .el-upload:hover {
    border-color: #409EFF;
  }
  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }
  .avatar {
    width: 178px;
    height: 178px;
    display: block;
  }
</style>